Re: [PATCH v2 00/11] mm: thp: always enable mTHP support

[David Hildenbrand (Arm)]

On 4/2/26 13:56, Luiz Capitulino wrote:
> On 2026-04-02 04:25, David Hildenbrand (Arm) wrote:
>> On 2/9/26 23:14, Luiz Capitulino wrote:
>>> Today, if an architecture implements has_transparent_hugepage() and
>>> the CPU
>>> lacks support for PMD-sized pages, the THP code disables all THP,
>>> including
>>> mTHP. In addition, the kernel lacks a well defined API to check for
>>> PMD-sized page support. It currently relies on
>>> has_transparent_hugepage()
>>> and thp_disabled_by_hw(), but they are not well defined and are tied to
>>> THP support.
>>>
>>> This series addresses both issues by introducing a new well defined API
>>> to query PMD-sized page support: pgtable_has_pmd_leaves(). Using this
>>> new helper, we ensure that mTHP remains enabled even when the
>>> architecture or CPU doesn't support PMD-sized pages.
>>>
>>> Thanks to David Hildenbrand for suggesting this improvement and for
>>> providing guidance (all bugs and misconceptions are mine).
>>>
>>> This applies to v6.19, but I tested it on v6.19-rc8+.
>>
>> Apologies for the delay Luiz (as told you off-list :) ), I'll try going
>> through this soon so we can start queuing this after -rc1.
> 
> Oh, wow, thanks for the support!
> 
> I intended to get back to this series this week to address Baolin's
> comments, but I got busy with other things (which is something I may
> bring up on upstream but it's not related to this series at all).
> 

Okay, I'll wait for your next posting and prioritize that :)

-- 
Cheers,

David